63c22f50b9279b8c3eb467a7fbae85ce696dfa1d
[ira/wip.git] / source3 / smbd / auth_smbpasswd.c
1 /* 
2    Unix SMB/Netbios implementation.
3    Version 1.9.
4    Password and authentication handling
5    Copyright (C) Andrew Tridgell              1992-2000
6    Copyright (C) Luke Kenneth Casson Leighton 1996-2000
7    Copyright (C) Andrew Bartlett              2001
8    
9    This program is free software; you can redistribute it and/or modify
10    it under the terms of the GNU General Public License as published by
11    the Free Software Foundation; either version 2 of the License, or
12    (at your option) any later version.
13    
14    This program is distributed in the hope that it will be useful,
15    but WITHOUT ANY WARRANTY; without even the implied warranty of
16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17    GNU General Public License for more details.
18    
19    You should have received a copy of the GNU General Public License
20    along with this program; if not, write to the Free Software
21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24 #include "includes.h"
25
26 /****************************************************************************
27 core of smb password checking routine.
28 ****************************************************************************/
29 static BOOL smb_pwd_check_ntlmv1(DATA_BLOB nt_response,
30                                 const uchar *part_passwd,
31                                 DATA_BLOB sec_blob,
32                                 uint8 user_sess_key[16])
33 {
34         /* Finish the encryption of part_passwd. */
35         uchar p24[24];
36         
37         if (part_passwd == NULL) {
38                 DEBUG(10,("No password set - DISALLOWING access\n"));
39                 /* No password set - always false ! */
40                 return False;
41         }
42         
43         if (sec_blob.length != 8) {
44                 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect challange size (%d)\n", sec_blob.length));
45                 return False;
46         }
47         
48         if (nt_response.length != 24) {
49                 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect password length (%d)\n", nt_response.length));
50                 return False;
51         }
52
53         SMBOWFencrypt(part_passwd, sec_blob.data, p24);
54         if (user_sess_key != NULL)
55         {
56                 SMBsesskeygen_ntv1(part_passwd, NULL, user_sess_key);
57         }
58         
59         
60         
61 #if DEBUG_PASSWORD
62         DEBUG(100,("Part password (P16) was |"));
63         dump_data(100, part_passwd, 16);
64         DEBUG(100,("Password from client was |"));
65         dump_data(100, nt_response.data, nt_response.length);
66         DEBUG(100,("Given challenge was |"));
67         dump_data(100, sec_blob.data, sec_blob.length);
68         DEBUG(100,("Value from encryption was |"));
69         dump_data(100, p24, 24);
70 #endif
71   return (memcmp(p24, nt_response.data, 24) == 0);
72 }
73
74 /****************************************************************************
75 core of smb password checking routine.
76 ****************************************************************************/
77 static BOOL smb_pwd_check_ntlmv2(const DATA_BLOB ntv2_response,
78                                 const uchar *part_passwd,
79                                 const DATA_BLOB sec_blob,
80                                 const char *user, const char *domain,
81                                 uint8 user_sess_key[16])
82 {
83         /* Finish the encryption of part_passwd. */
84         uchar kr[16];
85         uchar value_from_encryption[16];
86         uchar client_response[16];
87         DATA_BLOB client_key_data;
88
89         if (part_passwd == NULL)
90         {
91                 DEBUG(10,("No password set - DISALLOWING access\n"));
92                 /* No password set - always False */
93                 return False;
94         }
95
96         if (ntv2_response.length < 16) {
97                 /* We MUST have more than 16 bytes, or the stuff below will go
98                    crazy... */
99                 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect password length (%d)\n", 
100                           ntv2_response.length));
101                 return False;
102         }
103
104         client_key_data = data_blob(ntv2_response.data+16, ntv2_response.length-16);
105         memcpy(client_response, ntv2_response.data, sizeof(client_response));
106
107         ntv2_owf_gen(part_passwd, user, domain, kr);
108         SMBOWFencrypt_ntv2(kr, sec_blob, client_key_data, (char *)value_from_encryption);
109         if (user_sess_key != NULL)
110         {
111                 SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key);
112         }
113
114 #if DEBUG_PASSWORD
115         DEBUG(100,("Part password (P16) was |"));
116         dump_data(100, part_passwd, 16);
117         DEBUG(100,("Password from client was |"));
118         dump_data(100, ntv2_response.data, ntv2_response.length);
119         DEBUG(100,("Variable data from client was |"));
120         dump_data(100, client_key_data.data, client_key_data.length);
121         DEBUG(100,("Given challenge was |"));
122         dump_data(100, sec_blob.data, sec_blob.length);
123         DEBUG(100,("Value from encryption was |"));
124         dump_data(100, value_from_encryption, 16);
125 #endif
126         data_blob_clear_free(&client_key_data);
127         return (memcmp(value_from_encryption, client_response, 16) == 0);
128 }
129
130
131 /****************************************************************************
132  Do a specific test for an smb password being correct, given a smb_password and
133  the lanman and NT responses.
134 ****************************************************************************/
135 NTSTATUS sam_password_ok(SAM_ACCOUNT *sampass, const auth_usersupplied_info *user_info, uint8 user_sess_key[16])
136 {
137         const uint8 *nt_pw, *lm_pw;
138         uint16  acct_ctrl = pdb_get_acct_ctrl(sampass);
139         uint32 ntlmssp_flags;
140
141         if (!user_info || !sampass) 
142                 return NT_STATUS_LOGON_FAILURE;
143
144         if (acct_ctrl & ACB_PWNOTREQ) 
145         {
146                 if (lp_null_passwords()) 
147                 {
148                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", pdb_get_username(sampass)));
149                         return(NT_STATUS_OK);
150                 } 
151                 else 
152                 {
153                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", pdb_get_username(sampass)));
154                         return(NT_STATUS_LOGON_FAILURE);
155                 }               
156         }
157
158         nt_pw = pdb_get_nt_passwd(sampass);
159         lm_pw = pdb_get_lanman_passwd(sampass);
160         
161         ntlmssp_flags = user_info->ntlmssp_flags;
162
163         if (nt_pw == NULL) {
164                 DEBUG(3,("smb_password_ok: NO NT password stored for user %s.\n", 
165                          pdb_get_username(sampass)));
166                 /* No return, we want to check the LM hash below in this case */
167                 ntlmssp_flags &= (~(NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_NTLM2));
168         }
169
170         if (ntlmssp_flags & NTLMSSP_NEGOTIATE_NTLM2) {
171                         /* We have the NT MD4 hash challenge available - see if we can
172                            use it (ie. does it exist in the smbpasswd file).
173                         */
174                         DEBUG(4,("smb_password_ok: Checking NTLMv2 password\n"));
175                         if (smb_pwd_check_ntlmv2( user_info->nt_resp, 
176                                                   nt_pw, 
177                                                   user_info->sec_blob, user_info->smb_name.str, 
178                                                   user_info->client_domain.str,
179                                                   user_sess_key))
180                         {
181                                 return NT_STATUS_OK;
182                         } else {
183                                 DEBUG(3,("smb_password_ok: NTLMv2 password check failed\n"));
184                                 return NT_STATUS_WRONG_PASSWORD;
185                         }
186         } else if (ntlmssp_flags & NTLMSSP_NEGOTIATE_NTLM) {
187                         if (lp_ntlm_auth()) {                           
188                                 /* We have the NT MD4 hash challenge available - see if we can
189                                    use it (ie. does it exist in the smbpasswd file).
190                                 */
191                                 DEBUG(4,("smb_password_ok: Checking NT MD4 password\n"));
192                                 if (smb_pwd_check_ntlmv1(user_info->nt_resp, 
193                                                          nt_pw, user_info->sec_blob,
194                                                          user_sess_key)) 
195                                 {
196                                         return NT_STATUS_OK;
197                                 } else {
198                                         DEBUG(3,("smb_password_ok: NT MD4 password check failed for user %s\n",pdb_get_username(sampass)));
199                                         return NT_STATUS_WRONG_PASSWORD;
200                                 }
201                         } else {
202                                 DEBUG(2,("smb_password_ok: NTLMv1 passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));                   
203                                 /* No return, we want to check the LM hash below in this case */
204                         }
205         } 
206
207         if (lm_pw == NULL) {
208                 DEBUG(3,("smb_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n",pdb_get_username(sampass)));
209                 ntlmssp_flags &= (~NTLMSSP_NEGOTIATE_OEM);              
210         }
211         
212         if (ntlmssp_flags & NTLMSSP_NEGOTIATE_OEM) {
213                 
214                 if (user_info->lm_resp.length != 24) {
215                         DEBUG(2,("smb_password_ok: invalid LanMan password length (%d) for user %s\n", 
216                                  user_info->nt_resp.length, pdb_get_username(sampass)));                
217                 }
218                 
219                 if (!lp_lanman_auth()) {
220                         DEBUG(3,("smb_password_ok: Lanman passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));                   
221                         return NT_STATUS_LOGON_FAILURE;
222                 }
223                 
224                 DEBUG(4,("smb_password_ok: Checking LM password\n"));
225                 if (smb_pwd_check_ntlmv1(user_info->lm_resp, 
226                                          lm_pw, user_info->sec_blob,
227                                          user_sess_key)) 
228                 {
229                         return NT_STATUS_OK;
230                 } else {
231                         DEBUG(4,("smb_password_ok: LM password check failed for user %s\n",pdb_get_username(sampass)));
232                         return NT_STATUS_WRONG_PASSWORD;
233                 } 
234         }
235
236         /* Should not be reached, but if they send nothing... */
237         DEBUG(3,("smb_password_ok: NEITHER LanMan nor NT password supplied for user %s\n",pdb_get_username(sampass)));
238         return NT_STATUS_WRONG_PASSWORD;
239 }
240
241 /****************************************************************************
242  Do a specific test for a SAM_ACCOUNT being vaild for this connection 
243  (ie not disabled, expired and the like).
244 ****************************************************************************/
245 NTSTATUS sam_account_ok(SAM_ACCOUNT *sampass, const auth_usersupplied_info *user_info)
246 {
247         uint16  acct_ctrl = pdb_get_acct_ctrl(sampass);
248         char *workstation_list;
249         time_t kickoff_time;
250         
251         if (!user_info || !sampass) 
252                 return NT_STATUS_LOGON_FAILURE;
253
254         DEBUG(4,("smb_password_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
255
256         /* Quit if the account was disabled. */
257         if (acct_ctrl & ACB_DISABLED) {
258                 DEBUG(1,("Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
259                 return NT_STATUS_ACCOUNT_DISABLED;
260         }
261
262         /* Test account expire time */
263         
264         kickoff_time = pdb_get_kickoff_time(sampass);
265         if (kickoff_time != 0 && time(NULL) > kickoff_time) {
266                 DEBUG(1,("Account for user '%s' has expried.\n", pdb_get_username(sampass)));
267                 DEBUG(3,("Account expired at '%ld' unix time.\n", (long)kickoff_time));
268                 return NT_STATUS_ACCOUNT_EXPIRED;
269         }
270
271         /* Test workstation. Workstation list is comma separated. */
272
273         workstation_list = strdup(pdb_get_workstations(sampass));
274
275         if (!workstation_list) return NT_STATUS_NO_MEMORY;
276
277         if (*workstation_list) {
278                 BOOL invalid_ws = True;
279                 char *s = workstation_list;
280                         
281                 fstring tok;
282                         
283                 while (next_token(&s, tok, ",", sizeof(tok))) {
284                         DEBUG(10,("checking for workstation match %s and %s (len=%d)\n",
285                                   tok, user_info->wksta_name.str, user_info->wksta_name.len));
286                         if(strequal(tok, user_info->wksta_name.str)) {
287                                 invalid_ws = False;
288                                 break;
289                         }
290                 }
291                 
292                 SAFE_FREE(workstation_list);            
293                 if (invalid_ws) 
294                         return NT_STATUS_INVALID_WORKSTATION;
295         } else {
296                 SAFE_FREE(workstation_list);
297         }
298
299         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
300                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
301                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
302
303                 /* check for immediate expiry "must change at next logon" */
304                 if (must_change_time == 0 && last_set_time != 0) {
305                         DEBUG(1,("Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
306                         return NT_STATUS_PASSWORD_MUST_CHANGE;
307                 }
308
309                 /* check for expired password */
310                 if (must_change_time < time(NULL) && must_change_time != 0) {
311                         DEBUG(1,("Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
312                         DEBUG(1,("Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
313                         return NT_STATUS_PASSWORD_EXPIRED;
314                 }
315         }
316
317         if (acct_ctrl & ACB_DOMTRUST) {
318                 DEBUG(2,("session_trust_account: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
319                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
320         }
321         
322         if (acct_ctrl & ACB_SVRTRUST) {
323                 DEBUG(2,("session_trust_account: Server trust account %s denied by server\n", pdb_get_username(sampass)));
324                 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
325         }
326         
327         if (acct_ctrl & ACB_WSTRUST) {
328                 DEBUG(4,("session_trust_account: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
329                 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
330         }
331         
332         return NT_STATUS_OK;
333 }
334
335
336 /****************************************************************************
337 check if a username/password is OK assuming the password is a 24 byte
338 SMB hash supplied in the user_info structure
339 return an NT_STATUS constant.
340 ****************************************************************************/
341
342 NTSTATUS check_smbpasswd_security(const auth_usersupplied_info *user_info, auth_serversupplied_info **server_info)
343 {
344         SAM_ACCOUNT *sampass=NULL;
345         BOOL ret;
346         NTSTATUS nt_status;
347         uint8 user_sess_key[16];
348         const uint8* lm_hash;
349
350         pdb_init_sam(&sampass);
351
352         /* get the account information */
353
354         become_root();
355         ret = pdb_getsampwnam(sampass, user_info->internal_username.str);
356         unbecome_root();
357
358         if (ret == False)
359         {
360                 DEBUG(1,("Couldn't find user '%s' in passdb file.\n", user_info->internal_username.str));
361                 pdb_free_sam(&sampass);
362                 return NT_STATUS_NO_SUCH_USER;
363         }
364
365         nt_status = sam_password_ok(sampass, user_info, user_sess_key);
366
367         if (!NT_STATUS_IS_OK(nt_status)) {
368                 pdb_free_sam(&sampass);
369                 return nt_status;
370         }
371
372         nt_status = sam_account_ok(sampass, user_info);
373         
374         if (!NT_STATUS_IS_OK(nt_status)) {
375                 pdb_free_sam(&sampass);
376                 return nt_status;
377         }
378
379         if (!make_server_info_sam(server_info, sampass)) {              
380                 DEBUG(0,("failed to malloc memory for server_info\n"));
381                 return NT_STATUS_NO_MEMORY;
382         }
383
384         lm_hash = pdb_get_lanman_passwd((*server_info)->sam_account);
385         if (lm_hash) {
386                 memcpy((*server_info)->first_8_lm_hash, lm_hash, 8);
387         }
388         
389         memcpy((*server_info)->session_key, user_sess_key, sizeof(user_sess_key));
390
391         return nt_status;
392 }
393
394
395
396